alcohol stoves are easy with no smoke a wind shield cuts the amount of light. Aluminum foil in a bottle with lye, produces enough hydrogen to cook with https://www.youtube.com/watch?v=Pf2UpQNJ9q4 The flames will be almost invisible once passed through a bubbler.On the completely flameless side , Salt impregnated dried paper towels sandwiched between sheets of aluminum foil and stapled through, will get very hot when wet with even dirty watter.Short a car battery through a carbon rod.